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nfsd41: exchange_id operation
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4 80
8b671b80
BF		 81/* Locking: */
82
83/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 84static DEFINE_MUTEX(client_mutex);
1da177e4 85
8b671b80
BF		 86/*
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
90 */
91static DEFINE_SPINLOCK(recall_lock);
92
e18b890b
CL		 93static struct kmem_cache *stateowner_slab = NULL;
94static struct kmem_cache *file_slab = NULL;
95static struct kmem_cache *stateid_slab = NULL;
96static struct kmem_cache *deleg_slab = NULL;
e60d4398 97
1da177e4
LT		 98void
99nfs4_lock_state(void)
100{
353ab6e9 101 mutex_lock(&client_mutex);
1da177e4
LT		 102}
103
104void
105nfs4_unlock_state(void)
106{
353ab6e9 107 mutex_unlock(&client_mutex);
1da177e4
LT		 108}
109
110static inline u32
111opaque_hashval(const void *ptr, int nbytes)
112{
113 unsigned char *cptr = (unsigned char *) ptr;
114
115 u32 x = 0;
116 while (nbytes--) {
117 x *= 37;
118 x += *cptr++;
119 }
120 return x;
121}
122
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static inline void
126put_nfs4_file(struct nfs4_file *fi)
127{
8b671b80
BF		 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
131 iput(fi->fi_inode);
132 kmem_cache_free(file_slab, fi);
133 }
13cd2184
N		 134}
135
136static inline void
137get_nfs4_file(struct nfs4_file *fi)
138{
8b671b80 139 atomic_inc(&fi->fi_ref);
13cd2184
N		 140}
141
ef0f3390 142static int num_delegations;
c2f1a551 143unsigned int max_delegations;
ef0f3390
N		 144
145/*
146 * Open owner state (share locks)
147 */
148
149/* hash tables for nfs4_stateowner */
150#define OWNER_HASH_BITS 8
151#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
153
154#define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156#define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
158
159static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
161
162/* hash table for nfs4_file */
163#define FILE_HASH_BITS 8
164#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166/* hash table for (open)nfs4_stateid */
167#define STATEID_HASH_BITS 10
168#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
170
171#define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173#define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
175
176static struct list_head file_hashtbl[FILE_HASH_SIZE];
177static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
178
1da177e4
LT		 179static struct nfs4_delegation *
180alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
181{
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
185
186 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 187 if (fp->fi_had_conflict)
188 return NULL;
c2f1a551 189 if (num_delegations > max_delegations)
ef0f3390 190 return NULL;
5b2d21c1
N		 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
192 if (dp == NULL)
1da177e4 193 return dp;
ef0f3390 194 num_delegations++;
ea1da636
N		 195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 197 INIT_LIST_HEAD(&dp->dl_recall_lru);
198 dp->dl_client = clp;
13cd2184 199 get_nfs4_file(fp);
1da177e4
LT		 200 dp->dl_file = fp;
201 dp->dl_flock = NULL;
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
204 dp->dl_type = type;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
5282fd72
ME		 385static DEFINE_SPINLOCK(sessionid_lock);
386#define SESSION_HASH_SIZE 512
387static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
388
389static inline int
390hash_sessionid(struct nfs4_sessionid *sessionid)
391{
392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
393
394 return sid->sequence % SESSION_HASH_SIZE;
395}
396
397static inline void
398dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
399{
400 u32 *ptr = (u32 *)(&sessionid->data[0]);
401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
402}
403
404/* caller must hold sessionid_lock */
405static struct nfsd4_session *
406find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
407{
408 struct nfsd4_session *elem;
409 int idx;
410
411 dump_sessionid(__func__, sessionid);
412 idx = hash_sessionid(sessionid);
413 dprintk("%s: idx is %d\n", __func__, idx);
414 /* Search in the appropriate list */
415 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
416 dump_sessionid("list traversal", &elem->se_sessionid);
417 if (!memcmp(elem->se_sessionid.data, sessionid->data,
418 NFS4_MAX_SESSIONID_LEN)) {
419 return elem;
420 }
421 }
422
423 dprintk("%s: session not found\n", __func__);
424 return NULL;
425}
426
427/* caller must hold sessionid_lock */
7116ed6b 428static void
5282fd72 429unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 430{
431 list_del(&ses->se_hash);
432 list_del(&ses->se_perclnt);
5282fd72
ME		 433}
434
435static void
436release_session(struct nfsd4_session *ses)
437{
438 spin_lock(&sessionid_lock);
439 unhash_session(ses);
440 spin_unlock(&sessionid_lock);
7116ed6b
AA		 441 nfsd4_put_session(ses);
442}
443
444void
445free_session(struct kref *kref)
446{
447 struct nfsd4_session *ses;
448
449 ses = container_of(kref, struct nfsd4_session, se_ref);
450 kfree(ses->se_slots);
451 kfree(ses);
452}
453
1da177e4
LT		 454static inline void
455renew_client(struct nfs4_client *clp)
456{
457 /*
458 * Move client to the end to the LRU list.
459 */
460 dprintk("renewing client (clientid %08x/%08x)\n",
461 clp->cl_clientid.cl_boot,
462 clp->cl_clientid.cl_id);
463 list_move_tail(&clp->cl_lru, &client_lru);
464 clp->cl_time = get_seconds();
465}
466
467/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
468static int
469STALE_CLIENTID(clientid_t *clid)
470{
471 if (clid->cl_boot == boot_time)
472 return 0;
473 dprintk("NFSD stale clientid (%08x/%08x)\n",
474 clid->cl_boot, clid->cl_id);
475 return 1;
476}
477
478/*
479 * XXX Should we use a slab cache ?
480 * This type of memory management is somewhat inefficient, but we use it
481 * anyway since SETCLIENTID is not a common operation.
482 */
35bba9a3 483static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 484{
485 struct nfs4_client *clp;
486
35bba9a3
BF		 487 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
488 if (clp == NULL)
489 return NULL;
490 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
491 if (clp->cl_name.data == NULL) {
492 kfree(clp);
493 return NULL;
1da177e4 494 }
35bba9a3
BF		 495 memcpy(clp->cl_name.data, name.data, name.len);
496 clp->cl_name.len = name.len;
1da177e4
LT		 497 return clp;
498}
499
1b1a9b31
BF		 500static void
501shutdown_callback_client(struct nfs4_client *clp)
502{
503 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
504
1b1a9b31 505 if (clnt) {
404ec117
BF		 506 /*
507 * Callback threads take a reference on the client, so there
508 * should be no outstanding callbacks at this point.
509 */
1b1a9b31
BF		 510 clp->cl_callback.cb_client = NULL;
511 rpc_shutdown_client(clnt);
512 }
513}
514
1da177e4
LT		 515static inline void
516free_client(struct nfs4_client *clp)
517{
1b1a9b31 518 shutdown_callback_client(clp);
1da177e4
LT		 519 if (clp->cl_cred.cr_group_info)
520 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 521 kfree(clp->cl_principal);
1da177e4
LT		 522 kfree(clp->cl_name.data);
523 kfree(clp);
524}
525
526void
527put_nfs4_client(struct nfs4_client *clp)
528{
529 if (atomic_dec_and_test(&clp->cl_count))
530 free_client(clp);
531}
532
533static void
534expire_client(struct nfs4_client *clp)
535{
536 struct nfs4_stateowner *sop;
537 struct nfs4_delegation *dp;
1da177e4
LT		 538 struct list_head reaplist;
539
540 dprintk("NFSD: expire_client cl_count %d\n",
541 atomic_read(&clp->cl_count));
542
1da177e4
LT		 543 INIT_LIST_HEAD(&reaplist);
544 spin_lock(&recall_lock);
ea1da636
N		 545 while (!list_empty(&clp->cl_delegations)) {
546 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 547 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
548 dp->dl_flock);
ea1da636 549 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 550 list_move(&dp->dl_recall_lru, &reaplist);
551 }
552 spin_unlock(&recall_lock);
553 while (!list_empty(&reaplist)) {
554 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
555 list_del_init(&dp->dl_recall_lru);
556 unhash_delegation(dp);
557 }
558 list_del(&clp->cl_idhash);
559 list_del(&clp->cl_strhash);
560 list_del(&clp->cl_lru);
ea1da636
N		 561 while (!list_empty(&clp->cl_openowners)) {
562 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 563 release_openowner(sop);
1da177e4 564 }
c4bf7868
ME		 565 while (!list_empty(&clp->cl_sessions)) {
566 struct nfsd4_session *ses;
567 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
568 se_perclnt);
569 release_session(ses);
570 }
1da177e4
LT		 571 put_nfs4_client(clp);
572}
573
35bba9a3
BF		 574static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
575{
1da177e4
LT		 576 struct nfs4_client *clp;
577
35bba9a3
BF		 578 clp = alloc_client(name);
579 if (clp == NULL)
580 return NULL;
a55370a3 581 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 582 atomic_set(&clp->cl_count, 1);
583 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 584 INIT_LIST_HEAD(&clp->cl_idhash);
585 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 586 INIT_LIST_HEAD(&clp->cl_openowners);
587 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 588 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 589 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 590 return clp;
591}
592
35bba9a3
BF		 593static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
594{
595 memcpy(target->cl_verifier.data, source->data,
596 sizeof(target->cl_verifier.data));
1da177e4
LT		 597}
598
35bba9a3
BF		 599static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
600{
1da177e4
LT		 601 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
602 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
603}
604
35bba9a3
BF		 605static void copy_cred(struct svc_cred *target, struct svc_cred *source)
606{
1da177e4
LT		 607 target->cr_uid = source->cr_uid;
608 target->cr_gid = source->cr_gid;
609 target->cr_group_info = source->cr_group_info;
610 get_group_info(target->cr_group_info);
611}
612
35bba9a3 613static int same_name(const char *n1, const char *n2)
599e0a22 614{
a55370a3 615 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 616}
617
618static int
599e0a22
BF		 619same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
620{
621 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 622}
623
624static int
599e0a22
BF		 625same_clid(clientid_t *cl1, clientid_t *cl2)
626{
627 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 628}
629
630/* XXX what about NGROUP */
631static int
599e0a22
BF		 632same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
633{
634 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 635}
636
5ec7b46c
BF		 637static void gen_clid(struct nfs4_client *clp)
638{
639 static u32 current_clientid = 1;
640
1da177e4
LT		 641 clp->cl_clientid.cl_boot = boot_time;
642 clp->cl_clientid.cl_id = current_clientid++;
643}
644
deda2faa
BF		 645static void gen_confirm(struct nfs4_client *clp)
646{
647 static u32 i;
648 u32 *p;
1da177e4 649
1da177e4 650 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 651 *p++ = get_seconds();
652 *p++ = i++;
1da177e4
LT		 653}
654
35bba9a3
BF		 655static int check_name(struct xdr_netobj name)
656{
1da177e4
LT		 657 if (name.len == 0)
658 return 0;
659 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 660 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 661 return 0;
662 }
663 return 1;
664}
665
fd39ca9a 666static void
1da177e4
LT		 667add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
668{
669 unsigned int idhashval;
670
671 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
672 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
673 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
674 list_add_tail(&clp->cl_lru, &client_lru);
675 clp->cl_time = get_seconds();
676}
677
fd39ca9a 678static void
1da177e4
LT		 679move_to_confirmed(struct nfs4_client *clp)
680{
681 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
682 unsigned int strhashval;
683
684 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
685 list_del_init(&clp->cl_strhash);
f116629d 686 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 687 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 688 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
689 renew_client(clp);
690}
691
692static struct nfs4_client *
693find_confirmed_client(clientid_t *clid)
694{
695 struct nfs4_client *clp;
696 unsigned int idhashval = clientid_hashval(clid->cl_id);
697
698 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 699 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 700 return clp;
701 }
702 return NULL;
703}
704
705static struct nfs4_client *
706find_unconfirmed_client(clientid_t *clid)
707{
708 struct nfs4_client *clp;
709 unsigned int idhashval = clientid_hashval(clid->cl_id);
710
711 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 712 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 713 return clp;
714 }
715 return NULL;
716}
717
28ce6054
N		 718static struct nfs4_client *
719find_confirmed_client_by_str(const char *dname, unsigned int hashval)
720{
721 struct nfs4_client *clp;
722
723 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
724 if (same_name(clp->cl_recdir, dname))
725 return clp;
726 }
727 return NULL;
728}
729
730static struct nfs4_client *
731find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
732{
733 struct nfs4_client *clp;
734
735 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
736 if (same_name(clp->cl_recdir, dname))
737 return clp;
738 }
739 return NULL;
740}
741
1da177e4
LT		 742/* a helper function for parse_callback */
743static int
744parse_octet(unsigned int *lenp, char **addrp)
745{
746 unsigned int len = *lenp;
747 char *p = *addrp;
748 int n = -1;
749 char c;
750
751 for (;;) {
752 if (!len)
753 break;
754 len--;
755 c = *p++;
756 if (c == '.')
757 break;
758 if ((c < '0') || (c > '9')) {
759 n = -1;
760 break;
761 }
762 if (n < 0)
763 n = 0;
764 n = (n * 10) + (c - '0');
765 if (n > 255) {
766 n = -1;
767 break;
768 }
769 }
770 *lenp = len;
771 *addrp = p;
772 return n;
773}
774
775/* parse and set the setclientid ipv4 callback address */
fd39ca9a 776static int
1da177e4
LT		 777parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
778{
779 int temp = 0;
780 u32 cbaddr = 0;
781 u16 cbport = 0;
782 u32 addrlen = addr_len;
783 char *addr = addr_val;
784 int i, shift;
785
786 /* ipaddress */
787 shift = 24;
788 for(i = 4; i > 0 ; i--) {
789 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
790 return 0;
791 }
792 cbaddr |= (temp << shift);
793 if (shift > 0)
794 shift -= 8;
795 }
796 *cbaddrp = cbaddr;
797
798 /* port */
799 shift = 8;
800 for(i = 2; i > 0 ; i--) {
801 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
802 return 0;
803 }
804 cbport |= (temp << shift);
805 if (shift > 0)
806 shift -= 8;
807 }
808 *cbportp = cbport;
809 return 1;
810}
811
fd39ca9a 812static void
1da177e4
LT		 813gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
814{
815 struct nfs4_callback *cb = &clp->cl_callback;
816
817 /* Currently, we only support tcp for the callback channel */
818 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
819 goto out_err;
820
821 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
822 &cb->cb_addr, &cb->cb_port)))
823 goto out_err;
824 cb->cb_prog = se->se_callback_prog;
825 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 826 return;
827out_err:
849823c5 828 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 829 "will not receive delegations\n",
830 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
831
1da177e4
LT		 832 return;
833}
834
0733d213
AA		 835/*
836 * Set the exchange_id flags returned by the server.
837 */
838static void
839nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
840{
841 /* pNFS is not supported */
842 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
843
844 /* Referrals are supported, Migration is not. */
845 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
846
847 /* set the wire flags to return to client. */
848 clid->flags = new->cl_exchange_flags;
849}
850
069b6ad4
AA		 851__be32
852nfsd4_exchange_id(struct svc_rqst *rqstp,
853 struct nfsd4_compound_state *cstate,
854 struct nfsd4_exchange_id *exid)
855{
0733d213
AA		 856 struct nfs4_client *unconf, *conf, *new;
857 int status;
858 unsigned int strhashval;
859 char dname[HEXDIR_LEN];
860 nfs4_verifier verf = exid->verifier;
861 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
862
863 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
864 " ip_addr=%u flags %x, spa_how %d\n",
865 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
866 ip_addr, exid->flags, exid->spa_how);
867
868 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
869 return nfserr_inval;
870
871 /* Currently only support SP4_NONE */
872 switch (exid->spa_how) {
873 case SP4_NONE:
874 break;
875 case SP4_SSV:
876 return nfserr_encr_alg_unsupp;
877 default:
878 BUG(); /* checked by xdr code */
879 case SP4_MACH_CRED:
880 return nfserr_serverfault; /* no excuse :-/ */
881 }
882
883 status = nfs4_make_rec_clidname(dname, &exid->clname);
884
885 if (status)
886 goto error;
887
888 strhashval = clientstr_hashval(dname);
889
890 nfs4_lock_state();
891 status = nfs_ok;
892
893 conf = find_confirmed_client_by_str(dname, strhashval);
894 if (conf) {
895 if (!same_verf(&verf, &conf->cl_verifier)) {
896 /* 18.35.4 case 8 */
897 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
898 status = nfserr_not_same;
899 goto out;
900 }
901 /* Client reboot: destroy old state */
902 expire_client(conf);
903 goto out_new;
904 }
905 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
906 /* 18.35.4 case 9 */
907 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
908 status = nfserr_perm;
909 goto out;
910 }
911 expire_client(conf);
912 goto out_new;
913 }
914 if (ip_addr != conf->cl_addr &&
915 !(exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)) {
916 /* Client collision. 18.35.4 case 3 */
917 status = nfserr_clid_inuse;
918 goto out;
919 }
920 /*
921 * Set bit when the owner id and verifier map to an already
922 * confirmed client id (18.35.3).
923 */
924 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
925
926 /*
927 * Falling into 18.35.4 case 2, possible router replay.
928 * Leave confirmed record intact and return same result.
929 */
930 copy_verf(conf, &verf);
931 new = conf;
932 goto out_copy;
933 } else {
934 /* 18.35.4 case 7 */
935 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
936 status = nfserr_noent;
937 goto out;
938 }
939 }
940
941 unconf = find_unconfirmed_client_by_str(dname, strhashval);
942 if (unconf) {
943 /*
944 * Possible retry or client restart. Per 18.35.4 case 4,
945 * a new unconfirmed record should be generated regardless
946 * of whether any properties have changed.
947 */
948 expire_client(unconf);
949 }
950
951out_new:
952 /* Normal case */
953 new = create_client(exid->clname, dname);
954 if (new == NULL) {
955 status = nfserr_resource;
956 goto out;
957 }
958
959 copy_verf(new, &verf);
960 copy_cred(&new->cl_cred, &rqstp->rq_cred);
961 new->cl_addr = ip_addr;
962 gen_clid(new);
963 gen_confirm(new);
964 add_to_unconfirmed(new, strhashval);
965out_copy:
966 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
967 exid->clientid.cl_id = new->cl_clientid.cl_id;
968
969 new->cl_seqid = exid->seqid = 1;
970 nfsd4_set_ex_flags(new, exid);
971
972 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
973 new->cl_seqid, new->cl_exchange_flags);
974 status = nfs_ok;
975
976out:
977 nfs4_unlock_state();
978error:
979 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
980 return status;
069b6ad4
AA		 981}
982
983__be32
984nfsd4_create_session(struct svc_rqst *rqstp,
985 struct nfsd4_compound_state *cstate,
986 struct nfsd4_create_session *cr_ses)
987{
988 return -1; /* stub */
989}
990
991__be32
992nfsd4_destroy_session(struct svc_rqst *r,
993 struct nfsd4_compound_state *cstate,
994 struct nfsd4_destroy_session *sessionid)
995{
996 return -1; /* stub */
997}
998
999__be32
1000nfsd4_sequence(struct svc_rqst *r,
1001 struct nfsd4_compound_state *cstate,
1002 struct nfsd4_sequence *seq)
1003{
1004 return -1; /* stub */
1005}
1006
b37ad28b 1007__be32
b591480b
BF		 1008nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1009 struct nfsd4_setclientid *setclid)
1da177e4 1010{
27459f09 1011 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1012 struct xdr_netobj clname = {
1013 .len = setclid->se_namelen,
1014 .data = setclid->se_name,
1015 };
1016 nfs4_verifier clverifier = setclid->se_verf;
1017 unsigned int strhashval;
28ce6054 1018 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1019 __be32 status;
68e76ad0 1020 char *princ;
a55370a3 1021 char dname[HEXDIR_LEN];
1da177e4 1022
1da177e4 1023 if (!check_name(clname))
73aea4ec 1024 return nfserr_inval;
1da177e4 1025
a55370a3
N		 1026 status = nfs4_make_rec_clidname(dname, &clname);
1027 if (status)
73aea4ec 1028 return status;
a55370a3 1029
1da177e4
LT		 1030 /*
1031 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1032 * We get here on a DRC miss.
1033 */
1034
a55370a3 1035 strhashval = clientstr_hashval(dname);
1da177e4 1036
1da177e4 1037 nfs4_lock_state();
28ce6054
N		 1038 conf = find_confirmed_client_by_str(dname, strhashval);
1039 if (conf) {
a186e767 1040 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1041 status = nfserr_clid_inuse;
026722c2
BF		 1042 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1043 dprintk("NFSD: setclientid: string in use by client"
1044 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1045 goto out;
1046 }
1da177e4 1047 }
a186e767
BF		 1048 /*
1049 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1050 * has a description of SETCLIENTID request processing consisting
1051 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1052 */
28ce6054 1053 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 1054 status = nfserr_resource;
1055 if (!conf) {
a186e767
BF		 1056 /*
1057 * RFC 3530 14.2.33 CASE 4:
1058 * placed first, because it is the normal case
1da177e4
LT		 1059 */
1060 if (unconf)
1061 expire_client(unconf);
a55370a3
N		 1062 new = create_client(clname, dname);
1063 if (new == NULL)
1da177e4 1064 goto out;
1da177e4 1065 gen_clid(new);
599e0a22 1066 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1067 /*
a186e767
BF		 1068 * RFC 3530 14.2.33 CASE 1:
1069 * probable callback update
1da177e4 1070 */
31f4a6c1
N		 1071 if (unconf) {
1072 /* Note this is removing unconfirmed {*x***},
1073 * which is stronger than RFC recommended {vxc**}.
1074 * This has the advantage that there is at most
1075 * one {*x***} in either list at any time.
1076 */
1077 expire_client(unconf);
1da177e4 1078 }
a55370a3
N		 1079 new = create_client(clname, dname);
1080 if (new == NULL)
1da177e4 1081 goto out;
1da177e4 1082 copy_clid(new, conf);
1da177e4
LT		 1083 } else if (!unconf) {
1084 /*
a186e767
BF		 1085 * RFC 3530 14.2.33 CASE 2:
1086 * probable client reboot; state will be removed if
1087 * confirmed.
1da177e4 1088 */
a55370a3
N		 1089 new = create_client(clname, dname);
1090 if (new == NULL)
1da177e4 1091 goto out;
1da177e4 1092 gen_clid(new);
49ba8781 1093 } else {
a186e767
BF		 1094 /*
1095 * RFC 3530 14.2.33 CASE 3:
1096 * probable client reboot; state will be removed if
1097 * confirmed.
1da177e4
LT		 1098 */
1099 expire_client(unconf);
a55370a3
N		 1100 new = create_client(clname, dname);
1101 if (new == NULL)
1da177e4 1102 goto out;
1da177e4 1103 gen_clid(new);
1da177e4 1104 }
c175b83c
BF		 1105 copy_verf(new, &clverifier);
1106 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1107 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1108 princ = svc_gss_principal(rqstp);
1109 if (princ) {
1110 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1111 if (new->cl_principal == NULL) {
1112 free_client(new);
1113 goto out;
1114 }
1115 }
c175b83c
BF		 1116 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1117 gen_confirm(new);
1118 gen_callback(new, setclid);
1119 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1120 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1121 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1122 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1123 status = nfs_ok;
1124out:
1125 nfs4_unlock_state();
1126 return status;
1127}
1128
1129
1130/*
a186e767
BF		 1131 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1132 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1133 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1134 */
b37ad28b 1135__be32
b591480b
BF		 1136nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1137 struct nfsd4_compound_state *cstate,
1138 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1139{
27459f09 1140 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1141 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1142 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1143 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1144 __be32 status;
1da177e4
LT		 1145
1146 if (STALE_CLIENTID(clid))
1147 return nfserr_stale_clientid;
1148 /*
1149 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1150 * We get here on a DRC miss.
1151 */
1152
1153 nfs4_lock_state();
21ab45a4
N		 1154
1155 conf = find_confirmed_client(clid);
1156 unconf = find_unconfirmed_client(clid);
1157
1158 status = nfserr_clid_inuse;
27459f09 1159 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1160 goto out;
27459f09 1161 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1162 goto out;
1163
a186e767
BF		 1164 /*
1165 * section 14.2.34 of RFC 3530 has a description of
1166 * SETCLIENTID_CONFIRM request processing consisting
1167 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1168 */
366e0c1d 1169 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1170 /*
1171 * RFC 3530 14.2.34 CASE 1:
1172 * callback update
1173 */
599e0a22 1174 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1175 status = nfserr_clid_inuse;
1176 else {
1a69c179
N		 1177 /* XXX: We just turn off callbacks until we can handle
1178 * change request correctly. */
cb36d634 1179 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1180 gen_confirm(conf);
46309029 1181 nfsd4_remove_clid_dir(unconf);
1a69c179 1182 expire_client(unconf);
1da177e4 1183 status = nfs_ok;
1a69c179 1184
1da177e4 1185 }
f3aba4e5 1186 } else if (conf && !unconf) {
a186e767
BF		 1187 /*
1188 * RFC 3530 14.2.34 CASE 2:
1189 * probable retransmitted request; play it safe and
1190 * do nothing.
7c79f737 1191 */
599e0a22 1192 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1193 status = nfserr_clid_inuse;
21ab45a4 1194 else
1da177e4 1195 status = nfs_ok;
7c79f737 1196 } else if (!conf && unconf
599e0a22 1197 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1198 /*
1199 * RFC 3530 14.2.34 CASE 3:
1200 * Normal case; new or rebooted client:
7c79f737 1201 */
599e0a22 1202 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1203 status = nfserr_clid_inuse;
1204 } else {
1a69c179
N		 1205 unsigned int hash =
1206 clientstr_hashval(unconf->cl_recdir);
1207 conf = find_confirmed_client_by_str(unconf->cl_recdir,
1208 hash);
1209 if (conf) {
c7b9a459 1210 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1211 expire_client(conf);
1212 }
1da177e4 1213 move_to_confirmed(unconf);
21ab45a4 1214 conf = unconf;
46f8a64b 1215 nfsd4_probe_callback(conf);
1a69c179 1216 status = nfs_ok;
1da177e4 1217 }
599e0a22
BF		 1218 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1219 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1220 &confirm)))) {
a186e767
BF		 1221 /*
1222 * RFC 3530 14.2.34 CASE 4:
1223 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1224 */
1da177e4 1225 status = nfserr_stale_clientid;
7c79f737 1226 } else {
08e8987c
N		 1227 /* check that we have hit one of the cases...*/
1228 status = nfserr_clid_inuse;
1229 }
1da177e4 1230out:
1da177e4
LT		 1231 nfs4_unlock_state();
1232 return status;
1233}
1234
1da177e4
LT		 1235/* OPEN Share state helper functions */
1236static inline struct nfs4_file *
1237alloc_init_file(struct inode *ino)
1238{
1239 struct nfs4_file *fp;
1240 unsigned int hashval = file_hashval(ino);
1241
e60d4398
N		 1242 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1243 if (fp) {
8b671b80 1244 atomic_set(&fp->fi_ref, 1);
1da177e4 1245 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1246 INIT_LIST_HEAD(&fp->fi_stateids);
1247 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1248 spin_lock(&recall_lock);
1da177e4 1249 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1250 spin_unlock(&recall_lock);
1da177e4
LT		 1251 fp->fi_inode = igrab(ino);
1252 fp->fi_id = current_fileid++;
47f9940c 1253 fp->fi_had_conflict = false;
1da177e4
LT		 1254 return fp;
1255 }
1256 return NULL;
1257}
1258
e60d4398 1259static void
e18b890b 1260nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1261{
e60d4398
N		 1262 if (*slab == NULL)
1263 return;
1a1d92c1 1264 kmem_cache_destroy(*slab);
e60d4398 1265 *slab = NULL;
1da177e4
LT		 1266}
1267
e8ff2a84 1268void
1da177e4
LT		 1269nfsd4_free_slabs(void)
1270{
e60d4398
N		 1271 nfsd4_free_slab(&stateowner_slab);
1272 nfsd4_free_slab(&file_slab);
5ac049ac 1273 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1274 nfsd4_free_slab(&deleg_slab);
e60d4398 1275}
1da177e4 1276
e60d4398
N		 1277static int
1278nfsd4_init_slabs(void)
1279{
1280 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1281 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1282 if (stateowner_slab == NULL)
1283 goto out_nomem;
1284 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1285 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1286 if (file_slab == NULL)
1287 goto out_nomem;
5ac049ac 1288 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1289 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1290 if (stateid_slab == NULL)
1291 goto out_nomem;
5b2d21c1 1292 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1293 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1294 if (deleg_slab == NULL)
1295 goto out_nomem;
e60d4398
N		 1296 return 0;
1297out_nomem:
1298 nfsd4_free_slabs();
1299 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1300 return -ENOMEM;
1da177e4
LT		 1301}
1302
1303void
1304nfs4_free_stateowner(struct kref *kref)
1305{
1306 struct nfs4_stateowner *sop =
1307 container_of(kref, struct nfs4_stateowner, so_ref);
1308 kfree(sop->so_owner.data);
1309 kmem_cache_free(stateowner_slab, sop);
1310}
1311
1312static inline struct nfs4_stateowner *
1313alloc_stateowner(struct xdr_netobj *owner)
1314{
1315 struct nfs4_stateowner *sop;
1316
1317 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1318 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1319 memcpy(sop->so_owner.data, owner->data, owner->len);
1320 sop->so_owner.len = owner->len;
1321 kref_init(&sop->so_ref);
1322 return sop;
1323 }
1324 kmem_cache_free(stateowner_slab, sop);
1325 }
1326 return NULL;
1327}
1328
1329static struct nfs4_stateowner *
1330alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1331 struct nfs4_stateowner *sop;
1332 struct nfs4_replay *rp;
1333 unsigned int idhashval;
1334
1335 if (!(sop = alloc_stateowner(&open->op_owner)))
1336 return NULL;
1337 idhashval = ownerid_hashval(current_ownerid);
1338 INIT_LIST_HEAD(&sop->so_idhash);
1339 INIT_LIST_HEAD(&sop->so_strhash);
1340 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1341 INIT_LIST_HEAD(&sop->so_stateids);
1342 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1343 INIT_LIST_HEAD(&sop->so_close_lru);
1344 sop->so_time = 0;
1345 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1346 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1347 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1348 sop->so_is_open_owner = 1;
1349 sop->so_id = current_ownerid++;
1350 sop->so_client = clp;
1351 sop->so_seqid = open->op_seqid;
1352 sop->so_confirmed = 0;
1353 rp = &sop->so_replay;
de1ae286 1354 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1355 rp->rp_buflen = 0;
1356 rp->rp_buf = rp->rp_ibuf;
1357 return sop;
1358}
1359
1da177e4
LT		 1360static inline void
1361init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1362 struct nfs4_stateowner *sop = open->op_stateowner;
1363 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1364
1365 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1366 INIT_LIST_HEAD(&stp->st_perstateowner);
1367 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1368 INIT_LIST_HEAD(&stp->st_perfile);
1369 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1370 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1371 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1372 stp->st_stateowner = sop;
13cd2184 1373 get_nfs4_file(fp);
1da177e4
LT		 1374 stp->st_file = fp;
1375 stp->st_stateid.si_boot = boot_time;
1376 stp->st_stateid.si_stateownerid = sop->so_id;
1377 stp->st_stateid.si_fileid = fp->fi_id;
1378 stp->st_stateid.si_generation = 0;
1379 stp->st_access_bmap = 0;
1380 stp->st_deny_bmap = 0;
1381 __set_bit(open->op_share_access, &stp->st_access_bmap);
1382 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1383 stp->st_openstp = NULL;
1da177e4
LT		 1384}
1385
fd39ca9a 1386static void
1da177e4
LT		 1387move_to_close_lru(struct nfs4_stateowner *sop)
1388{
1389 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1390
358dd55a 1391 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1392 sop->so_time = get_seconds();
1393}
1394
1da177e4 1395static int
599e0a22
BF		 1396same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1397 clientid_t *clid)
1398{
1399 return (sop->so_owner.len == owner->len) &&
1400 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1401 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1402}
1403
1404static struct nfs4_stateowner *
1405find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1406{
1407 struct nfs4_stateowner *so = NULL;
1408
1409 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1410 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1411 return so;
1412 }
1413 return NULL;
1414}
1415
1416/* search file_hashtbl[] for file */
1417static struct nfs4_file *
1418find_file(struct inode *ino)
1419{
1420 unsigned int hashval = file_hashval(ino);
1421 struct nfs4_file *fp;
1422
8b671b80 1423 spin_lock(&recall_lock);
1da177e4 1424 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1425 if (fp->fi_inode == ino) {
1426 get_nfs4_file(fp);
8b671b80 1427 spin_unlock(&recall_lock);
1da177e4 1428 return fp;
13cd2184 1429 }
1da177e4 1430 }
8b671b80 1431 spin_unlock(&recall_lock);
1da177e4
LT		 1432 return NULL;
1433}
1434
8838dc43 1435static inline int access_valid(u32 x)
ba5a6a19 1436{
8838dc43
BF		 1437 if (x < NFS4_SHARE_ACCESS_READ)
1438 return 0;
1439 if (x > NFS4_SHARE_ACCESS_BOTH)
1440 return 0;
1441 return 1;
ba5a6a19
BF		 1442}
1443
8838dc43 1444static inline int deny_valid(u32 x)
ba5a6a19 1445{
8838dc43
BF		 1446 /* Note: unlike access bits, deny bits may be zero. */
1447 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1448}
1da177e4 1449
4f83aa30
BF		 1450/*
1451 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1452 * st_{access,deny}_bmap field of the stateid, in order to track not
1453 * only what share bits are currently in force, but also what
1454 * combinations of share bits previous opens have used. This allows us
1455 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1456 * return an error if the client attempt to downgrade to a combination
1457 * of share bits not explicable by closing some of its previous opens.
1458 *
1459 * XXX: This enforcement is actually incomplete, since we don't keep
1460 * track of access/deny bit combinations; so, e.g., we allow:
1461 *
1462 * OPEN allow read, deny write
1463 * OPEN allow both, deny none
1464 * DOWNGRADE allow read, deny none
1465 *
1466 * which we should reject.
1467 */
fd39ca9a 1468static void
1da177e4
LT		 1469set_access(unsigned int *access, unsigned long bmap) {
1470 int i;
1471
1472 *access = 0;
1473 for (i = 1; i < 4; i++) {
1474 if (test_bit(i, &bmap))
1475 *access |= i;
1476 }
1477}
1478
fd39ca9a 1479static void
1da177e4
LT		 1480set_deny(unsigned int *deny, unsigned long bmap) {
1481 int i;
1482
1483 *deny = 0;
1484 for (i = 0; i < 4; i++) {
1485 if (test_bit(i, &bmap))
1486 *deny |= i ;
1487 }
1488}
1489
1490static int
1491test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1492 unsigned int access, deny;
1493
1494 set_access(&access, stp->st_access_bmap);
1495 set_deny(&deny, stp->st_deny_bmap);
1496 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1497 return 0;
1498 return 1;
1499}
1500
1501/*
1502 * Called to check deny when READ with all zero stateid or
1503 * WRITE with all zero or all one stateid
1504 */
b37ad28b 1505static __be32
1da177e4
LT		 1506nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1507{
1508 struct inode *ino = current_fh->fh_dentry->d_inode;
1509 struct nfs4_file *fp;
1510 struct nfs4_stateid *stp;
b37ad28b 1511 __be32 ret;
1da177e4
LT		 1512
1513 dprintk("NFSD: nfs4_share_conflict\n");
1514
1515 fp = find_file(ino);
13cd2184
N		 1516 if (!fp)
1517 return nfs_ok;
b700949b 1518 ret = nfserr_locked;
1da177e4 1519 /* Search for conflicting share reservations */
13cd2184
N		 1520 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1521 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1522 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1523 goto out;
1da177e4 1524 }
13cd2184
N		 1525 ret = nfs_ok;
1526out:
1527 put_nfs4_file(fp);
1528 return ret;
1da177e4
LT		 1529}
1530
1531static inline void
1532nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1533{
1534 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1535 drop_file_write_access(filp);
1da177e4
LT		 1536 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1537 }
1538}
1539
1540/*
1541 * Recall a delegation
1542 */
1543static int
1544do_recall(void *__dp)
1545{
1546 struct nfs4_delegation *dp = __dp;
1547
47f9940c 1548 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1549 nfsd4_cb_recall(dp);
1550 return 0;
1551}
1552
1553/*
1554 * Spawn a thread to perform a recall on the delegation represented
1555 * by the lease (file_lock)
1556 *
1557 * Called from break_lease() with lock_kernel() held.
1558 * Note: we assume break_lease will only call this *once* for any given
1559 * lease.
1560 */
1561static
1562void nfsd_break_deleg_cb(struct file_lock *fl)
1563{
1564 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1565 struct task_struct *t;
1566
1567 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1568 if (!dp)
1569 return;
1570
1571 /* We're assuming the state code never drops its reference
1572 * without first removing the lease. Since we're in this lease
1573 * callback (and since the lease code is serialized by the kernel
1574 * lock) we know the server hasn't removed the lease yet, we know
1575 * it's safe to take a reference: */
1576 atomic_inc(&dp->dl_count);
cfdcad4d 1577 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1578
1579 spin_lock(&recall_lock);
1580 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1581 spin_unlock(&recall_lock);
1582
1583 /* only place dl_time is set. protected by lock_kernel*/
1584 dp->dl_time = get_seconds();
1585
0272e1fd
BF		 1586 /*
1587 * We don't want the locks code to timeout the lease for us;
1588 * we'll remove it ourself if the delegation isn't returned
1589 * in time.
1590 */
1591 fl->fl_break_time = 0;
1da177e4
LT		 1592
1593 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1594 if (IS_ERR(t)) {
1595 struct nfs4_client *clp = dp->dl_client;
1596
1597 printk(KERN_INFO "NFSD: Callback thread failed for "
1598 "for client (clientid %08x/%08x)\n",
1599 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1600 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1601 nfs4_put_delegation(dp);
1602 }
1603}
1604
1605/*
1606 * The file_lock is being reapd.
1607 *
1608 * Called by locks_free_lock() with lock_kernel() held.
1609 */
1610static
1611void nfsd_release_deleg_cb(struct file_lock *fl)
1612{
1613 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1614
1615 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1616
1617 if (!(fl->fl_flags & FL_LEASE) || !dp)
1618 return;
1619 dp->dl_flock = NULL;
1620}
1621
1622/*
1623 * Set the delegation file_lock back pointer.
1624 *
a9933cea 1625 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1626 */
1627static
1628void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1629{
1630 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1631
1632 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1633 if (!dp)
1634 return;
1635 dp->dl_flock = new;
1636}
1637
1638/*
a9933cea 1639 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1640 */
1641static
1642int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1643{
1644 struct nfs4_delegation *onlistd =
1645 (struct nfs4_delegation *)onlist->fl_owner;
1646 struct nfs4_delegation *tryd =
1647 (struct nfs4_delegation *)try->fl_owner;
1648
1649 if (onlist->fl_lmops != try->fl_lmops)
1650 return 0;
1651
1652 return onlistd->dl_client == tryd->dl_client;
1653}
1654
1655
1656static
1657int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1658{
1659 if (arg & F_UNLCK)
1660 return lease_modify(onlist, arg);
1661 else
1662 return -EAGAIN;
1663}
1664
fd39ca9a 1665static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1666 .fl_break = nfsd_break_deleg_cb,
1667 .fl_release_private = nfsd_release_deleg_cb,
1668 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1669 .fl_mylease = nfsd_same_client_deleg_cb,
1670 .fl_change = nfsd_change_deleg_cb,
1671};
1672
1673
b37ad28b 1674__be32
1da177e4
LT		 1675nfsd4_process_open1(struct nfsd4_open *open)
1676{
1da177e4
LT		 1677 clientid_t *clientid = &open->op_clientid;
1678 struct nfs4_client *clp = NULL;
1679 unsigned int strhashval;
1680 struct nfs4_stateowner *sop = NULL;
1681
1da177e4 1682 if (!check_name(open->op_owner))
0f442aa2 1683 return nfserr_inval;
1da177e4
LT		 1684
1685 if (STALE_CLIENTID(&open->op_clientid))
1686 return nfserr_stale_clientid;
1687
1688 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1689 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1690 open->op_stateowner = sop;
1691 if (!sop) {
1692 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1693 clp = find_confirmed_client(clientid);
1694 if (clp == NULL)
0f442aa2
BF		 1695 return nfserr_expired;
1696 goto renew;
1da177e4 1697 }
0f442aa2
BF		 1698 if (!sop->so_confirmed) {
1699 /* Replace unconfirmed owners without checking for replay. */
1700 clp = sop->so_client;
f044ff83 1701 release_openowner(sop);
0f442aa2
BF		 1702 open->op_stateowner = NULL;
1703 goto renew;
1704 }
1705 if (open->op_seqid == sop->so_seqid - 1) {
1706 if (sop->so_replay.rp_buflen)
a90b061c 1707 return nfserr_replay_me;
0f442aa2
BF		 1708 /* The original OPEN failed so spectacularly
1709 * that we don't even have replay data saved!
1710 * Therefore, we have no choice but to continue
1711 * processing this OPEN; presumably, we'll
1712 * fail again for the same reason.
1713 */
1714 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1715 goto renew;
1716 }
1717 if (open->op_seqid != sop->so_seqid)
1718 return nfserr_bad_seqid;
1da177e4 1719renew:
0f442aa2
BF		 1720 if (open->op_stateowner == NULL) {
1721 sop = alloc_init_open_stateowner(strhashval, clp, open);
1722 if (sop == NULL)
1723 return nfserr_resource;
1724 open->op_stateowner = sop;
1725 }
1726 list_del_init(&sop->so_close_lru);
1da177e4 1727 renew_client(sop->so_client);
0f442aa2 1728 return nfs_ok;
1da177e4
LT		 1729}
1730
b37ad28b 1731static inline __be32
4a6e43e6
N		 1732nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1733{
1734 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1735 return nfserr_openmode;
1736 else
1737 return nfs_ok;
1738}
1739
52f4fb43
N		 1740static struct nfs4_delegation *
1741find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1742{
1743 struct nfs4_delegation *dp;
1744
ea1da636 1745 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1746 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1747 return dp;
1748 }
1749 return NULL;
1750}
1751
b37ad28b 1752static __be32
567d9829
N		 1753nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1754 struct nfs4_delegation **dp)
1755{
1756 int flags;
b37ad28b 1757 __be32 status = nfserr_bad_stateid;
567d9829
N		 1758
1759 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1760 if (*dp == NULL)
c44c5eeb 1761 goto out;
567d9829
N		 1762 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1763 RD_STATE : WR_STATE;
1764 status = nfs4_check_delegmode(*dp, flags);
1765 if (status)
1766 *dp = NULL;
c44c5eeb
N		 1767out:
1768 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1769 return nfs_ok;
1770 if (status)
1771 return status;
1772 open->op_stateowner->so_confirmed = 1;
1773 return nfs_ok;
567d9829
N		 1774}
1775
b37ad28b 1776static __be32
1da177e4
LT		 1777nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1778{
1779 struct nfs4_stateid *local;
b37ad28b 1780 __be32 status = nfserr_share_denied;
1da177e4
LT		 1781 struct nfs4_stateowner *sop = open->op_stateowner;
1782
8beefa24 1783 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1784 /* ignore lock owners */
1785 if (local->st_stateowner->so_is_open_owner == 0)
1786 continue;
1787 /* remember if we have seen this open owner */
1788 if (local->st_stateowner == sop)
1789 *stpp = local;
1790 /* check for conflicting share reservations */
1791 if (!test_share(local, open))
1792 goto out;
1793 }
1794 status = 0;
1795out:
1796 return status;
1797}
1798
5ac049ac
N		 1799static inline struct nfs4_stateid *
1800nfs4_alloc_stateid(void)
1801{
1802 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1803}
1804
b37ad28b 1805static __be32
1da177e4 1806nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1807 struct nfs4_delegation *dp,
1da177e4
LT		 1808 struct svc_fh *cur_fh, int flags)
1809{
1810 struct nfs4_stateid *stp;
1da177e4 1811
5ac049ac 1812 stp = nfs4_alloc_stateid();
1da177e4
LT		 1813 if (stp == NULL)
1814 return nfserr_resource;
1815
567d9829
N		 1816 if (dp) {
1817 get_file(dp->dl_vfs_file);
1818 stp->st_vfs_file = dp->dl_vfs_file;
1819 } else {
b37ad28b 1820 __be32 status;
567d9829
N		 1821 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1822 &stp->st_vfs_file);
1823 if (status) {
1824 if (status == nfserr_dropit)
1825 status = nfserr_jukebox;
5ac049ac 1826 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1827 return status;
1828 }
1da177e4 1829 }
1da177e4
LT		 1830 *stpp = stp;
1831 return 0;
1832}
1833
b37ad28b 1834static inline __be32
1da177e4
LT		 1835nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1836 struct nfsd4_open *open)
1837{
1838 struct iattr iattr = {
1839 .ia_valid = ATTR_SIZE,
1840 .ia_size = 0,
1841 };
1842 if (!open->op_truncate)
1843 return 0;
1844 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1845 return nfserr_inval;
1da177e4
LT		 1846 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1847}
1848
b37ad28b 1849static __be32
1da177e4
LT		 1850nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1851{
1852 struct file *filp = stp->st_vfs_file;
7eaa36e2 1853 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1854 unsigned int share_access, new_writer;
b37ad28b 1855 __be32 status;
1da177e4
LT		 1856
1857 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1858 new_writer = (~share_access) & open->op_share_access
1859 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1860
6c26d08f 1861 if (new_writer) {
b37ad28b
AV		 1862 int err = get_write_access(inode);
1863 if (err)
1864 return nfserrno(err);
e518f056
BH		 1865 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1866 if (err)
1867 return nfserrno(err);
1868 file_take_write(filp);
6c26d08f 1869 }
1da177e4
LT		 1870 status = nfsd4_truncate(rqstp, cur_fh, open);
1871 if (status) {
6c26d08f
BF		 1872 if (new_writer)
1873 put_write_access(inode);
1da177e4
LT		 1874 return status;
1875 }
1876 /* remember the open */
6c26d08f 1877 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1878 __set_bit(open->op_share_access, &stp->st_access_bmap);
1879 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1880
1881 return nfs_ok;
1882}
1883
1884
1da177e4 1885static void
37515177 1886nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1887{
37515177
N		 1888 open->op_stateowner->so_confirmed = 1;
1889 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1890}
1891
1892/*
1893 * Attempt to hand out a delegation.
1894 */
1895static void
1896nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1897{
1898 struct nfs4_delegation *dp;
1899 struct nfs4_stateowner *sop = stp->st_stateowner;
1900 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1901 struct file_lock fl, *flp = &fl;
1902 int status, flag = 0;
1903
1904 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1905 open->op_recall = 0;
1906 switch (open->op_claim_type) {
1907 case NFS4_OPEN_CLAIM_PREVIOUS:
1908 if (!atomic_read(&cb->cb_set))
1909 open->op_recall = 1;
1910 flag = open->op_delegate_type;
1911 if (flag == NFS4_OPEN_DELEGATE_NONE)
1912 goto out;
1913 break;
1914 case NFS4_OPEN_CLAIM_NULL:
1915 /* Let's not give out any delegations till everyone's
1916 * had the chance to reclaim theirs.... */
af558e33 1917 if (locks_in_grace())
7b190fec
N		 1918 goto out;
1919 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1920 goto out;
1921 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1922 flag = NFS4_OPEN_DELEGATE_WRITE;
1923 else
1924 flag = NFS4_OPEN_DELEGATE_READ;
1925 break;
1926 default:
1927 goto out;
1928 }
1da177e4
LT		 1929
1930 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1931 if (dp == NULL) {
1932 flag = NFS4_OPEN_DELEGATE_NONE;
1933 goto out;
1934 }
1935 locks_init_lock(&fl);
1936 fl.fl_lmops = &nfsd_lease_mng_ops;
1937 fl.fl_flags = FL_LEASE;
9167f501 1938 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1939 fl.fl_end = OFFSET_MAX;
1940 fl.fl_owner = (fl_owner_t)dp;
1941 fl.fl_file = stp->st_vfs_file;
1942 fl.fl_pid = current->tgid;
1943
a9933cea 1944 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1945 * the lock_manager callbacks fl_mylease and fl_change are used
1946 */
9167f501 1947 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1948 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1949 unhash_delegation(dp);
1da177e4
LT		 1950 flag = NFS4_OPEN_DELEGATE_NONE;
1951 goto out;
1952 }
1953
1954 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1955
1956 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1957 dp->dl_stateid.si_boot,
1958 dp->dl_stateid.si_stateownerid,
1959 dp->dl_stateid.si_fileid,
1960 dp->dl_stateid.si_generation);
1961out:
7b190fec
N		 1962 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1963 && flag == NFS4_OPEN_DELEGATE_NONE
1964 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1965 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1966 open->op_delegate_type = flag;
1967}
1968
1969/*
1970 * called with nfs4_lock_state() held.
1971 */
b37ad28b 1972__be32
1da177e4
LT		 1973nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1974{
1975 struct nfs4_file *fp = NULL;
1976 struct inode *ino = current_fh->fh_dentry->d_inode;
1977 struct nfs4_stateid *stp = NULL;
567d9829 1978 struct nfs4_delegation *dp = NULL;
b37ad28b 1979 __be32 status;
1da177e4
LT		 1980
1981 status = nfserr_inval;
ba5a6a19
BF		 1982 if (!access_valid(open->op_share_access)
1983 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1984 goto out;
1985 /*
1986 * Lookup file; if found, lookup stateid and check open request,
1987 * and check for delegations in the process of being recalled.
1988 * If not found, create the nfs4_file struct
1989 */
1990 fp = find_file(ino);
1991 if (fp) {
1992 if ((status = nfs4_check_open(fp, open, &stp)))
1993 goto out;
c44c5eeb
N		 1994 status = nfs4_check_deleg(fp, open, &dp);
1995 if (status)
1996 goto out;
1da177e4 1997 } else {
c44c5eeb
N		 1998 status = nfserr_bad_stateid;
1999 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2000 goto out;
1da177e4
LT		 2001 status = nfserr_resource;
2002 fp = alloc_init_file(ino);
2003 if (fp == NULL)
2004 goto out;
2005 }
2006
2007 /*
2008 * OPEN the file, or upgrade an existing OPEN.
2009 * If truncate fails, the OPEN fails.
2010 */
2011 if (stp) {
2012 /* Stateid was found, this is an OPEN upgrade */
2013 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2014 if (status)
2015 goto out;
444c2c07 2016 update_stateid(&stp->st_stateid);
1da177e4
LT		 2017 } else {
2018 /* Stateid was not found, this is a new OPEN */
2019 int flags = 0;
9ecb6a08 2020 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2021 flags |= NFSD_MAY_READ;
1da177e4 2022 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2023 flags |= NFSD_MAY_WRITE;
567d9829
N		 2024 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2025 if (status)
1da177e4
LT		 2026 goto out;
2027 init_stateid(stp, fp, open);
2028 status = nfsd4_truncate(rqstp, current_fh, open);
2029 if (status) {
2283963f 2030 release_open_stateid(stp);
1da177e4
LT		 2031 goto out;
2032 }
2033 }
2034 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2035
2036 /*
2037 * Attempt to hand out a delegation. No error return, because the
2038 * OPEN succeeds even if we fail.
2039 */
2040 nfs4_open_delegation(current_fh, open, stp);
2041
2042 status = nfs_ok;
2043
2044 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2045 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2046 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2047out:
13cd2184
N		 2048 if (fp)
2049 put_nfs4_file(fp);
37515177
N		 2050 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2051 nfs4_set_claim_prev(open);
1da177e4
LT		 2052 /*
2053 * To finish the open response, we just need to set the rflags.
2054 */
2055 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2056 if (!open->op_stateowner->so_confirmed)
2057 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2058
2059 return status;
2060}
2061
b37ad28b 2062__be32
b591480b
BF		 2063nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2064 clientid_t *clid)
1da177e4
LT		 2065{
2066 struct nfs4_client *clp;
b37ad28b 2067 __be32 status;
1da177e4
LT		 2068
2069 nfs4_lock_state();
2070 dprintk("process_renew(%08x/%08x): starting\n",
2071 clid->cl_boot, clid->cl_id);
2072 status = nfserr_stale_clientid;
2073 if (STALE_CLIENTID(clid))
2074 goto out;
2075 clp = find_confirmed_client(clid);
2076 status = nfserr_expired;
2077 if (clp == NULL) {
2078 /* We assume the client took too long to RENEW. */
2079 dprintk("nfsd4_renew: clientid not found!\n");
2080 goto out;
2081 }
2082 renew_client(clp);
2083 status = nfserr_cb_path_down;
ea1da636 2084 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 2085 && !atomic_read(&clp->cl_callback.cb_set))
2086 goto out;
2087 status = nfs_ok;
2088out:
2089 nfs4_unlock_state();
2090 return status;
2091}
2092
af558e33
BF		 2093struct lock_manager nfsd4_manager = {
2094};
2095
a76b4319 2096static void
af558e33 2097nfsd4_end_grace(void)
a76b4319
N		 2098{
2099 dprintk("NFSD: end of grace period\n");
c7b9a459 2100 nfsd4_recdir_purge_old();
af558e33 2101 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2102}
2103
fd39ca9a 2104static time_t
1da177e4
LT		 2105nfs4_laundromat(void)
2106{
2107 struct nfs4_client *clp;
2108 struct nfs4_stateowner *sop;
2109 struct nfs4_delegation *dp;
2110 struct list_head *pos, *next, reaplist;
2111 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2112 time_t t, clientid_val = NFSD_LEASE_TIME;
2113 time_t u, test_val = NFSD_LEASE_TIME;
2114
2115 nfs4_lock_state();
2116
2117 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2118 if (locks_in_grace())
2119 nfsd4_end_grace();
1da177e4
LT		 2120 list_for_each_safe(pos, next, &client_lru) {
2121 clp = list_entry(pos, struct nfs4_client, cl_lru);
2122 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2123 t = clp->cl_time - cutoff;
2124 if (clientid_val > t)
2125 clientid_val = t;
2126 break;
2127 }
2128 dprintk("NFSD: purging unused client (clientid %08x)\n",
2129 clp->cl_clientid.cl_id);
c7b9a459 2130 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2131 expire_client(clp);
2132 }
2133 INIT_LIST_HEAD(&reaplist);
2134 spin_lock(&recall_lock);
2135 list_for_each_safe(pos, next, &del_recall_lru) {
2136 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2137 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2138 u = dp->dl_time - cutoff;
2139 if (test_val > u)
2140 test_val = u;
2141 break;
2142 }
2143 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2144 dp, dp->dl_flock);
2145 list_move(&dp->dl_recall_lru, &reaplist);
2146 }
2147 spin_unlock(&recall_lock);
2148 list_for_each_safe(pos, next, &reaplist) {
2149 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2150 list_del_init(&dp->dl_recall_lru);
2151 unhash_delegation(dp);
2152 }
2153 test_val = NFSD_LEASE_TIME;
2154 list_for_each_safe(pos, next, &close_lru) {
2155 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2156 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2157 u = sop->so_time - cutoff;
2158 if (test_val > u)
2159 test_val = u;
2160 break;
2161 }
2162 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2163 sop->so_id);
f044ff83 2164 release_openowner(sop);
1da177e4
LT		 2165 }
2166 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2167 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2168 nfs4_unlock_state();
2169 return clientid_val;
2170}
2171
a254b246
HH		 2172static struct workqueue_struct *laundry_wq;
2173static void laundromat_main(struct work_struct *);
2174static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2175
2176static void
c4028958 2177laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2178{
2179 time_t t;
2180
2181 t = nfs4_laundromat();
2182 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2183 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2184}
2185
fd39ca9a 2186static struct nfs4_stateowner *
f8816512
N		 2187search_close_lru(u32 st_id, int flags)
2188{
1da177e4
LT		 2189 struct nfs4_stateowner *local = NULL;
2190
1da177e4
LT		 2191 if (flags & CLOSE_STATE) {
2192 list_for_each_entry(local, &close_lru, so_close_lru) {
2193 if (local->so_id == st_id)
2194 return local;
2195 }
2196 }
2197 return NULL;
2198}
2199
2200static inline int
2201nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2202{
7eaa36e2 2203 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2204}
2205
2206static int
2207STALE_STATEID(stateid_t *stateid)
2208{
2209 if (stateid->si_boot == boot_time)
2210 return 0;
849823c5 2211 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2212 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2213 stateid->si_generation);
2214 return 1;
2215}
2216
2217static inline int
2218access_permit_read(unsigned long access_bmap)
2219{
2220 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2221 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2222 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2223}
2224
2225static inline int
2226access_permit_write(unsigned long access_bmap)
2227{
2228 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2229 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2230}
2231
2232static
b37ad28b 2233__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2234{
b37ad28b 2235 __be32 status = nfserr_openmode;
1da177e4
LT		 2236
2237 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2238 goto out;
2239 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2240 goto out;
2241 status = nfs_ok;
2242out:
2243 return status;
2244}
2245
b37ad28b 2246static inline __be32
1da177e4
LT		 2247check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2248{
203a8c8e 2249 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2250 return nfs_ok;
af558e33 2251 else if (locks_in_grace()) {
1da177e4
LT		 2252 /* Answer in remaining cases depends on existance of
2253 * conflicting state; so we must wait out the grace period. */
2254 return nfserr_grace;
2255 } else if (flags & WR_STATE)
2256 return nfs4_share_conflict(current_fh,
2257 NFS4_SHARE_DENY_WRITE);
2258 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2259 return nfs4_share_conflict(current_fh,
2260 NFS4_SHARE_DENY_READ);
2261}
2262
2263/*
2264 * Allow READ/WRITE during grace period on recovered state only for files
2265 * that are not able to provide mandatory locking.
2266 */
2267static inline int
18f82731 2268grace_disallows_io(struct inode *inode)
1da177e4 2269{
203a8c8e 2270 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2271}
2272
0836f587
BF		 2273static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2274{
2275 /* If the client sends us a stateid from the future, it's buggy: */
2276 if (in->si_generation > ref->si_generation)
2277 return nfserr_bad_stateid;
2278 /*
2279 * The following, however, can happen. For example, if the
2280 * client sends an open and some IO at the same time, the open
2281 * may bump si_generation while the IO is still in flight.
2282 * Thanks to hard links and renames, the client never knows what
2283 * file an open will affect. So it could avoid that situation
2284 * only by serializing all opens and IO from the same open
2285 * owner. To recover from the old_stateid error, the client
2286 * will just have to retry the IO:
2287 */
2288 if (in->si_generation < ref->si_generation)
2289 return nfserr_old_stateid;
2290 return nfs_ok;
2291}
2292
3e633079
BF		 2293static int is_delegation_stateid(stateid_t *stateid)
2294{
2295 return stateid->si_fileid == 0;
2296}
2297
1da177e4
LT		 2298/*
2299* Checks for stateid operations
2300*/
b37ad28b 2301__be32
1da177e4
LT		 2302nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2303{
2304 struct nfs4_stateid *stp = NULL;
2305 struct nfs4_delegation *dp = NULL;
1da177e4 2306 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2307 __be32 status;
1da177e4 2308
1da177e4
LT		 2309 if (filpp)
2310 *filpp = NULL;
2311
18f82731 2312 if (grace_disallows_io(ino))
1da177e4
LT		 2313 return nfserr_grace;
2314
2315 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2316 return check_special_stateids(current_fh, stateid, flags);
2317
1da177e4
LT		 2318 status = nfserr_stale_stateid;
2319 if (STALE_STATEID(stateid))
2320 goto out;
2321
1da177e4 2322 status = nfserr_bad_stateid;
3e633079 2323 if (is_delegation_stateid(stateid)) {
a4455be0 2324 dp = find_delegation_stateid(ino, stateid);
819a8f53 2325 if (!dp)
1da177e4 2326 goto out;
fd03b099 2327 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2328 if (status)
2329 goto out;
dc9bf700
BF		 2330 status = nfs4_check_delegmode(dp, flags);
2331 if (status)
2332 goto out;
2333 renew_client(dp->dl_client);
dc9bf700
BF		 2334 if (filpp)
2335 *filpp = dp->dl_vfs_file;
1da177e4 2336 } else { /* open or lock stateid */
a4455be0 2337 stp = find_stateid(stateid, flags);
819a8f53 2338 if (!stp)
1da177e4 2339 goto out;
6150ef0d 2340 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2341 goto out;
2342 if (!stp->st_stateowner->so_confirmed)
2343 goto out;
fd03b099 2344 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2345 if (status)
2346 goto out;
a4455be0
BF		 2347 status = nfs4_check_openmode(stp, flags);
2348 if (status)
1da177e4
LT		 2349 goto out;
2350 renew_client(stp->st_stateowner->so_client);
2351 if (filpp)
2352 *filpp = stp->st_vfs_file;
1da177e4
LT		 2353 }
2354 status = nfs_ok;
2355out:
2356 return status;
2357}
2358
4c4cd222
N		 2359static inline int
2360setlkflg (int type)
2361{
2362 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2363 RD_STATE : WR_STATE;
2364}
1da177e4
LT		 2365
2366/*
2367 * Checks for sequence id mutating operations.
2368 */
b37ad28b 2369static __be32
4c4cd222 2370nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2371{
1da177e4
LT		 2372 struct nfs4_stateid *stp;
2373 struct nfs4_stateowner *sop;
0836f587 2374 __be32 status;
1da177e4
LT		 2375
2376 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2377 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2378 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2379 stateid->si_generation);
3a4f98bb 2380
1da177e4
LT		 2381 *stpp = NULL;
2382 *sopp = NULL;
2383
1da177e4 2384 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2385 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2386 return nfserr_bad_stateid;
1da177e4
LT		 2387 }
2388
1da177e4 2389 if (STALE_STATEID(stateid))
3a4f98bb 2390 return nfserr_stale_stateid;
1da177e4
LT		 2391 /*
2392 * We return BAD_STATEID if filehandle doesn't match stateid,
2393 * the confirmed flag is incorrecly set, or the generation
2394 * number is incorrect.
1da177e4 2395 */
f8816512
N		 2396 stp = find_stateid(stateid, flags);
2397 if (stp == NULL) {
2398 /*
2399 * Also, we should make sure this isn't just the result of
2400 * a replayed close:
2401 */
2402 sop = search_close_lru(stateid->si_stateownerid, flags);
2403 if (sop == NULL)
2404 return nfserr_bad_stateid;
2405 *sopp = sop;
2406 goto check_replay;
2407 }
1da177e4 2408
39325bd0
BF		 2409 *stpp = stp;
2410 *sopp = sop = stp->st_stateowner;
2411
4c4cd222 2412 if (lock) {
4c4cd222 2413 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2414 struct nfs4_client *clp = sop->so_client;
4c4cd222 2415 int lkflg = 0;
b37ad28b 2416 __be32 status;
4c4cd222
N		 2417
2418 lkflg = setlkflg(lock->lk_type);
2419
2420 if (lock->lk_is_new) {
599e0a22
BF		 2421 if (!sop->so_is_open_owner)
2422 return nfserr_bad_stateid;
2423 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2424 return nfserr_bad_stateid;
599e0a22
BF		 2425 /* stp is the open stateid */
2426 status = nfs4_check_openmode(stp, lkflg);
2427 if (status)
2428 return status;
2429 } else {
2430 /* stp is the lock stateid */
2431 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2432 if (status)
2433 return status;
4c4cd222 2434 }
1da177e4
LT		 2435 }
2436
f3362737 2437 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2438 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2439 return nfserr_bad_stateid;
1da177e4
LT		 2440 }
2441
1da177e4
LT		 2442 /*
2443 * We now validate the seqid and stateid generation numbers.
2444 * For the moment, we ignore the possibility of
2445 * generation number wraparound.
2446 */
bd9aac52 2447 if (seqid != sop->so_seqid)
1da177e4
LT		 2448 goto check_replay;
2449
3a4f98bb 2450 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2451 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2452 " unconfirmed stateowner!\n");
2453 return nfserr_bad_stateid;
1da177e4 2454 }
3a4f98bb 2455 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2456 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2457 " confirmed yet!\n");
2458 return nfserr_bad_stateid;
1da177e4 2459 }
0836f587
BF		 2460 status = check_stateid_generation(stateid, &stp->st_stateid);
2461 if (status)
2462 return status;
52fd004e 2463 renew_client(sop->so_client);
3a4f98bb 2464 return nfs_ok;
1da177e4 2465
1da177e4 2466check_replay:
bd9aac52 2467 if (seqid == sop->so_seqid - 1) {
849823c5 2468 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2469 /* indicate replay to calling function */
a90b061c 2470 return nfserr_replay_me;
1da177e4 2471 }
2fdada03 2472 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2473 sop->so_seqid, seqid);
2474 *sopp = NULL;
2475 return nfserr_bad_seqid;
1da177e4
LT		 2476}
2477
b37ad28b 2478__be32
ca364317 2479nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2480 struct nfsd4_open_confirm *oc)
1da177e4 2481{
b37ad28b 2482 __be32 status;
1da177e4
LT		 2483 struct nfs4_stateowner *sop;
2484 struct nfs4_stateid *stp;
2485
2486 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2487 (int)cstate->current_fh.fh_dentry->d_name.len,
2488 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2489
ca364317 2490 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2491 if (status)
2492 return status;
1da177e4
LT		 2493
2494 nfs4_lock_state();
2495
ca364317
BF		 2496 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2497 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2498 CONFIRM | OPEN_STATE,
1da177e4
LT		 2499 &oc->oc_stateowner, &stp, NULL)))
2500 goto out;
2501
2502 sop = oc->oc_stateowner;
2503 sop->so_confirmed = 1;
2504 update_stateid(&stp->st_stateid);
2505 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2506 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2507 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2508 stp->st_stateid.si_boot,
2509 stp->st_stateid.si_stateownerid,
2510 stp->st_stateid.si_fileid,
2511 stp->st_stateid.si_generation);
c7b9a459
N		 2512
2513 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2514out:
f2327d9a 2515 if (oc->oc_stateowner) {
1da177e4 2516 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2517 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2518 }
1da177e4
LT		 2519 nfs4_unlock_state();
2520 return status;
2521}
2522
2523
2524/*
2525 * unset all bits in union bitmap (bmap) that
2526 * do not exist in share (from successful OPEN_DOWNGRADE)
2527 */
2528static void
2529reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2530{
2531 int i;
2532 for (i = 1; i < 4; i++) {
2533 if ((i & access) != i)
2534 __clear_bit(i, bmap);
2535 }
2536}
2537
2538static void
2539reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2540{
2541 int i;
2542 for (i = 0; i < 4; i++) {
2543 if ((i & deny) != i)
2544 __clear_bit(i, bmap);
2545 }
2546}
2547
b37ad28b 2548__be32
ca364317
BF		 2549nfsd4_open_downgrade(struct svc_rqst *rqstp,
2550 struct nfsd4_compound_state *cstate,
a4f1706a 2551 struct nfsd4_open_downgrade *od)
1da177e4 2552{
b37ad28b 2553 __be32 status;
1da177e4
LT		 2554 struct nfs4_stateid *stp;
2555 unsigned int share_access;
2556
2557 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2558 (int)cstate->current_fh.fh_dentry->d_name.len,
2559 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2560
ba5a6a19
BF		 2561 if (!access_valid(od->od_share_access)
2562 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2563 return nfserr_inval;
2564
2565 nfs4_lock_state();
ca364317
BF		 2566 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2567 od->od_seqid,
1da177e4 2568 &od->od_stateid,
f3362737 2569 OPEN_STATE,
1da177e4
LT		 2570 &od->od_stateowner, &stp, NULL)))
2571 goto out;
2572
2573 status = nfserr_inval;
2574 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2575 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2576 stp->st_access_bmap, od->od_share_access);
2577 goto out;
2578 }
2579 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2580 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2581 stp->st_deny_bmap, od->od_share_deny);
2582 goto out;
2583 }
2584 set_access(&share_access, stp->st_access_bmap);
2585 nfs4_file_downgrade(stp->st_vfs_file,
2586 share_access & ~od->od_share_access);
2587
2588 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2589 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2590
2591 update_stateid(&stp->st_stateid);
2592 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2593 status = nfs_ok;
2594out:
f2327d9a 2595 if (od->od_stateowner) {
1da177e4 2596 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2597 cstate->replay_owner = od->od_stateowner;
f2327d9a 2598 }
1da177e4
LT		 2599 nfs4_unlock_state();
2600 return status;
2601}
2602
2603/*
2604 * nfs4_unlock_state() called after encode
2605 */
b37ad28b 2606__be32
ca364317 2607nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2608 struct nfsd4_close *close)
1da177e4 2609{
b37ad28b 2610 __be32 status;
1da177e4
LT		 2611 struct nfs4_stateid *stp;
2612
2613 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2614 (int)cstate->current_fh.fh_dentry->d_name.len,
2615 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2616
2617 nfs4_lock_state();
2618 /* check close_lru for replay */
ca364317
BF		 2619 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2620 close->cl_seqid,
1da177e4 2621 &close->cl_stateid,
f3362737 2622 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2623 &close->cl_stateowner, &stp, NULL)))
2624 goto out;
1da177e4
LT		 2625 status = nfs_ok;
2626 update_stateid(&stp->st_stateid);
2627 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2628
04ef5954 2629 /* release_stateid() calls nfsd_close() if needed */
2283963f 2630 release_open_stateid(stp);
04ef5954
BF		 2631
2632 /* place unused nfs4_stateowners on so_close_lru list to be
2633 * released by the laundromat service after the lease period
2634 * to enable us to handle CLOSE replay
2635 */
2636 if (list_empty(&close->cl_stateowner->so_stateids))
2637 move_to_close_lru(close->cl_stateowner);
1da177e4 2638out:
f2327d9a 2639 if (close->cl_stateowner) {
1da177e4 2640 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2641 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2642 }
1da177e4
LT		 2643 nfs4_unlock_state();
2644 return status;
2645}
2646
b37ad28b 2647__be32
ca364317
BF		 2648nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2649 struct nfsd4_delegreturn *dr)
1da177e4 2650{
203a8c8e
BF		 2651 struct nfs4_delegation *dp;
2652 stateid_t *stateid = &dr->dr_stateid;
2653 struct inode *inode;
b37ad28b 2654 __be32 status;
1da177e4 2655
ca364317 2656 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2657 return status;
2658 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2659
2660 nfs4_lock_state();
203a8c8e
BF		 2661 status = nfserr_bad_stateid;
2662 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2663 goto out;
2664 status = nfserr_stale_stateid;
2665 if (STALE_STATEID(stateid))
2666 goto out;
7e0f7cf5 2667 status = nfserr_bad_stateid;
203a8c8e
BF		 2668 if (!is_delegation_stateid(stateid))
2669 goto out;
203a8c8e
BF		 2670 dp = find_delegation_stateid(inode, stateid);
2671 if (!dp)
2672 goto out;
2673 status = check_stateid_generation(stateid, &dp->dl_stateid);
2674 if (status)
2675 goto out;
2676 renew_client(dp->dl_client);
2677
2678 unhash_delegation(dp);
1da177e4 2679out:
203a8c8e
BF		 2680 nfs4_unlock_state();
2681
1da177e4
LT		 2682 return status;
2683}
2684
2685
2686/*
2687 * Lock owner state (byte-range locks)
2688 */
2689#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2690#define LOCK_HASH_BITS 8
2691#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2692#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2693
87df4de8
BH		 2694static inline u64
2695end_offset(u64 start, u64 len)
2696{
2697 u64 end;
2698
2699 end = start + len;
2700 return end >= start ? end: NFS4_MAX_UINT64;
2701}
2702
2703/* last octet in a range */
2704static inline u64
2705last_byte_offset(u64 start, u64 len)
2706{
2707 u64 end;
2708
2709 BUG_ON(!len);
2710 end = start + len;
2711 return end > start ? end - 1: NFS4_MAX_UINT64;
2712}
2713
1da177e4
LT		 2714#define lockownerid_hashval(id) \
2715 ((id) & LOCK_HASH_MASK)
2716
2717static inline unsigned int
2718lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2719 struct xdr_netobj *ownername)
2720{
2721 return (file_hashval(inode) + cl_id
2722 + opaque_hashval(ownername->data, ownername->len))
2723 & LOCK_HASH_MASK;
2724}
2725
2726static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2727static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2728static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2729
fd39ca9a 2730static struct nfs4_stateid *
1da177e4
LT		 2731find_stateid(stateid_t *stid, int flags)
2732{
9346eff0 2733 struct nfs4_stateid *local;
1da177e4
LT		 2734 u32 st_id = stid->si_stateownerid;
2735 u32 f_id = stid->si_fileid;
2736 unsigned int hashval;
2737
2738 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2739 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2740 hashval = stateid_hashval(st_id, f_id);
2741 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2742 if ((local->st_stateid.si_stateownerid == st_id) &&
2743 (local->st_stateid.si_fileid == f_id))
2744 return local;
2745 }
2746 }
9346eff0
KK		 2747
2748 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2749 hashval = stateid_hashval(st_id, f_id);
2750 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2751 if ((local->st_stateid.si_stateownerid == st_id) &&
2752 (local->st_stateid.si_fileid == f_id))
2753 return local;
2754 }
849823c5 2755 }
1da177e4
LT		 2756 return NULL;
2757}
2758
2759static struct nfs4_delegation *
2760find_delegation_stateid(struct inode *ino, stateid_t *stid)
2761{
13cd2184
N		 2762 struct nfs4_file *fp;
2763 struct nfs4_delegation *dl;
1da177e4
LT		 2764
2765 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2766 stid->si_boot, stid->si_stateownerid,
2767 stid->si_fileid, stid->si_generation);
2768
1da177e4 2769 fp = find_file(ino);
13cd2184
N		 2770 if (!fp)
2771 return NULL;
2772 dl = find_delegation_file(fp, stid);
2773 put_nfs4_file(fp);
2774 return dl;
1da177e4
LT		 2775}
2776
2777/*
2778 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2779 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2780 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2781 * locking, this prevents us from being completely protocol-compliant. The
2782 * real solution to this problem is to start using unsigned file offsets in
2783 * the VFS, but this is a very deep change!
2784 */
2785static inline void
2786nfs4_transform_lock_offset(struct file_lock *lock)
2787{
2788 if (lock->fl_start < 0)
2789 lock->fl_start = OFFSET_MAX;
2790 if (lock->fl_end < 0)
2791 lock->fl_end = OFFSET_MAX;
2792}
2793
d5b9026a
N		 2794/* Hack!: For now, we're defining this just so we can use a pointer to it
2795 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2796static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2797};
1da177e4
LT		 2798
2799static inline void
2800nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2801{
d5b9026a
N		 2802 struct nfs4_stateowner *sop;
2803 unsigned int hval;
1da177e4 2804
d5b9026a
N		 2805 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2806 sop = (struct nfs4_stateowner *) fl->fl_owner;
2807 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2808 kref_get(&sop->so_ref);
2809 deny->ld_sop = sop;
2810 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2811 } else {
2812 deny->ld_sop = NULL;
2813 deny->ld_clientid.cl_boot = 0;
2814 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2815 }
2816 deny->ld_start = fl->fl_start;
87df4de8
BH		 2817 deny->ld_length = NFS4_MAX_UINT64;
2818 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2819 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2820 deny->ld_type = NFS4_READ_LT;
2821 if (fl->fl_type != F_RDLCK)
2822 deny->ld_type = NFS4_WRITE_LT;
2823}
2824
1da177e4
LT		 2825static struct nfs4_stateowner *
2826find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2827 struct xdr_netobj *owner)
2828{
2829 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2830 struct nfs4_stateowner *op;
2831
2832 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2833 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2834 return op;
2835 }
2836 return NULL;
2837}
2838
2839/*
2840 * Alloc a lock owner structure.
2841 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2842 * occured.
2843 *
2844 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2845 */
2846
2847static struct nfs4_stateowner *
2848alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2849 struct nfs4_stateowner *sop;
2850 struct nfs4_replay *rp;
2851 unsigned int idhashval;
2852
2853 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2854 return NULL;
2855 idhashval = lockownerid_hashval(current_ownerid);
2856 INIT_LIST_HEAD(&sop->so_idhash);
2857 INIT_LIST_HEAD(&sop->so_strhash);
2858 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2859 INIT_LIST_HEAD(&sop->so_stateids);
2860 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2861 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2862 sop->so_time = 0;
2863 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2864 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2865 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2866 sop->so_is_open_owner = 0;
2867 sop->so_id = current_ownerid++;
2868 sop->so_client = clp;
b59e3c0e
NB		 2869 /* It is the openowner seqid that will be incremented in encode in the
2870 * case of new lockowners; so increment the lock seqid manually: */
2871 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2872 sop->so_confirmed = 1;
2873 rp = &sop->so_replay;
de1ae286 2874 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2875 rp->rp_buflen = 0;
2876 rp->rp_buf = rp->rp_ibuf;
2877 return sop;
2878}
2879
fd39ca9a 2880static struct nfs4_stateid *
1da177e4
LT		 2881alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2882{
2883 struct nfs4_stateid *stp;
2884 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2885
5ac049ac
N		 2886 stp = nfs4_alloc_stateid();
2887 if (stp == NULL)
1da177e4
LT		 2888 goto out;
2889 INIT_LIST_HEAD(&stp->st_hash);
2890 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2891 INIT_LIST_HEAD(&stp->st_perstateowner);
2892 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2893 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2894 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2895 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2896 stp->st_stateowner = sop;
13cd2184 2897 get_nfs4_file(fp);
1da177e4
LT		 2898 stp->st_file = fp;
2899 stp->st_stateid.si_boot = boot_time;
2900 stp->st_stateid.si_stateownerid = sop->so_id;
2901 stp->st_stateid.si_fileid = fp->fi_id;
2902 stp->st_stateid.si_generation = 0;
2903 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2904 stp->st_access_bmap = open_stp->st_access_bmap;
2905 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2906 stp->st_openstp = open_stp;
1da177e4
LT		 2907
2908out:
2909 return stp;
2910}
2911
fd39ca9a 2912static int
1da177e4
LT		 2913check_lock_length(u64 offset, u64 length)
2914{
87df4de8 2915 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2916 LOFF_OVERFLOW(offset, length)));
2917}
2918
2919/*
2920 * LOCK operation
2921 */
b37ad28b 2922__be32
ca364317 2923nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2924 struct nfsd4_lock *lock)
1da177e4 2925{
3e9e3dbe 2926 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2927 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2928 struct nfs4_stateid *lock_stp;
2929 struct file *filp;
2930 struct file_lock file_lock;
8dc7c311 2931 struct file_lock conflock;
b37ad28b 2932 __be32 status = 0;
1da177e4 2933 unsigned int strhashval;
150b3934 2934 unsigned int cmd;
b8dd7b9a 2935 int err;
1da177e4
LT		 2936
2937 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2938 (long long) lock->lk_offset,
2939 (long long) lock->lk_length);
2940
1da177e4
LT		 2941 if (check_lock_length(lock->lk_offset, lock->lk_length))
2942 return nfserr_inval;
2943
ca364317 2944 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2945 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2946 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2947 return status;
2948 }
2949
1da177e4
LT		 2950 nfs4_lock_state();
2951
2952 if (lock->lk_is_new) {
893f8770
N		 2953 /*
2954 * Client indicates that this is a new lockowner.
2955 * Use open owner and open stateid to create lock owner and
2956 * lock stateid.
2957 */
1da177e4
LT		 2958 struct nfs4_stateid *open_stp = NULL;
2959 struct nfs4_file *fp;
2960
2961 status = nfserr_stale_clientid;
849823c5 2962 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2963 goto out;
1da177e4 2964
1da177e4 2965 /* validate and update open stateid and open seqid */
ca364317 2966 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2967 lock->lk_new_open_seqid,
2968 &lock->lk_new_open_stateid,
f3362737 2969 OPEN_STATE,
3a65588a 2970 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2971 lock);
37515177 2972 if (status)
1da177e4 2973 goto out;
3a65588a 2974 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2975 /* create lockowner and lock stateid */
2976 fp = open_stp->st_file;
2977 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2978 open_sop->so_client->cl_clientid.cl_id,
2979 &lock->v.new.owner);
3e9e3dbe
N		 2980 /* XXX: Do we need to check for duplicate stateowners on
2981 * the same file, or should they just be allowed (and
2982 * create new stateids)? */
1da177e4 2983 status = nfserr_resource;
b59e3c0e
NB		 2984 lock_sop = alloc_init_lock_stateowner(strhashval,
2985 open_sop->so_client, open_stp, lock);
2986 if (lock_sop == NULL)
1da177e4 2987 goto out;
b59e3c0e 2988 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2989 if (lock_stp == NULL)
1da177e4 2990 goto out;
1da177e4
LT		 2991 } else {
2992 /* lock (lock owner + lock stateid) already exists */
ca364317 2993 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2994 lock->lk_old_lock_seqid,
2995 &lock->lk_old_lock_stateid,
f3362737 2996 LOCK_STATE,
3a65588a 2997 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2998 if (status)
2999 goto out;
3a65588a 3000 lock_sop = lock->lk_replay_owner;
1da177e4 3001 }
3a65588a 3002 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3003 filp = lock_stp->st_vfs_file;
3004
0dd395dc 3005 status = nfserr_grace;
af558e33 3006 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3007 goto out;
3008 status = nfserr_no_grace;
af558e33 3009 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3010 goto out;
3011
1da177e4
LT		 3012 locks_init_lock(&file_lock);
3013 switch (lock->lk_type) {
3014 case NFS4_READ_LT:
3015 case NFS4_READW_LT:
3016 file_lock.fl_type = F_RDLCK;
150b3934 3017 cmd = F_SETLK;
1da177e4
LT		 3018 break;
3019 case NFS4_WRITE_LT:
3020 case NFS4_WRITEW_LT:
3021 file_lock.fl_type = F_WRLCK;
150b3934 3022 cmd = F_SETLK;
1da177e4
LT		 3023 break;
3024 default:
3025 status = nfserr_inval;
3026 goto out;
3027 }
b59e3c0e 3028 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3029 file_lock.fl_pid = current->tgid;
3030 file_lock.fl_file = filp;
3031 file_lock.fl_flags = FL_POSIX;
d5b9026a 3032 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3033
3034 file_lock.fl_start = lock->lk_offset;
87df4de8 3035 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3036 nfs4_transform_lock_offset(&file_lock);
3037
3038 /*
3039 * Try to lock the file in the VFS.
3040 * Note: locks.c uses the BKL to protect the inode's lock list.
3041 */
3042
fd85b817 3043 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3044 switch (-err) {
1da177e4
LT		 3045 case 0: /* success! */
3046 update_stateid(&lock_stp->st_stateid);
3047 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3048 sizeof(stateid_t));
b8dd7b9a 3049 status = 0;
eb76b3fd
AA		 3050 break;
3051 case (EAGAIN): /* conflock holds conflicting lock */
3052 status = nfserr_denied;
3053 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3054 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3055 break;
1da177e4
LT		 3056 case (EDEADLK):
3057 status = nfserr_deadlock;
eb76b3fd 3058 break;
1da177e4 3059 default:
fd85b817 3060 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3061 status = nfserr_resource;
3062 break;
1da177e4 3063 }
1da177e4 3064out:
8a280510 3065 if (status && lock->lk_is_new && lock_sop)
f044ff83 3066 release_lockowner(lock_sop);
3a65588a
BF		 3067 if (lock->lk_replay_owner) {
3068 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3069 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3070 }
1da177e4
LT		 3071 nfs4_unlock_state();
3072 return status;
3073}
3074
55ef1274
BF		 3075/*
3076 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3077 * so we do a temporary open here just to get an open file to pass to
3078 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3079 * inode operation.)
3080 */
3081static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3082{
3083 struct file *file;
3084 int err;
3085
3086 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3087 if (err)
3088 return err;
3089 err = vfs_test_lock(file, lock);
3090 nfsd_close(file);
3091 return err;
3092}
3093
1da177e4
LT		 3094/*
3095 * LOCKT operation
3096 */
b37ad28b 3097__be32
ca364317
BF		 3098nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3099 struct nfsd4_lockt *lockt)
1da177e4
LT		 3100{
3101 struct inode *inode;
1da177e4 3102 struct file_lock file_lock;
fd85b817 3103 int error;
b37ad28b 3104 __be32 status;
1da177e4 3105
af558e33 3106 if (locks_in_grace())
1da177e4
LT		 3107 return nfserr_grace;
3108
3109 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3110 return nfserr_inval;
3111
3112 lockt->lt_stateowner = NULL;
3113 nfs4_lock_state();
3114
3115 status = nfserr_stale_clientid;
849823c5 3116 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3117 goto out;
1da177e4 3118
ca364317 3119 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3120 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3121 if (status == nfserr_symlink)
3122 status = nfserr_inval;
3123 goto out;
3124 }
3125
ca364317 3126 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3127 locks_init_lock(&file_lock);
3128 switch (lockt->lt_type) {
3129 case NFS4_READ_LT:
3130 case NFS4_READW_LT:
3131 file_lock.fl_type = F_RDLCK;
3132 break;
3133 case NFS4_WRITE_LT:
3134 case NFS4_WRITEW_LT:
3135 file_lock.fl_type = F_WRLCK;
3136 break;
3137 default:
2fdada03 3138 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3139 status = nfserr_inval;
3140 goto out;
3141 }
3142
3143 lockt->lt_stateowner = find_lockstateowner_str(inode,
3144 &lockt->lt_clientid, &lockt->lt_owner);
3145 if (lockt->lt_stateowner)
3146 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3147 file_lock.fl_pid = current->tgid;
3148 file_lock.fl_flags = FL_POSIX;
3149
3150 file_lock.fl_start = lockt->lt_offset;
87df4de8 3151 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3152
3153 nfs4_transform_lock_offset(&file_lock);
3154
1da177e4 3155 status = nfs_ok;
55ef1274 3156 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3157 if (error) {
3158 status = nfserrno(error);
3159 goto out;
3160 }
9d6a8c5c 3161 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3162 status = nfserr_denied;
9d6a8c5c 3163 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3164 }
3165out:
3166 nfs4_unlock_state();
3167 return status;
3168}
3169
b37ad28b 3170__be32
ca364317 3171nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3172 struct nfsd4_locku *locku)
1da177e4
LT		 3173{
3174 struct nfs4_stateid *stp;
3175 struct file *filp = NULL;
3176 struct file_lock file_lock;
b37ad28b 3177 __be32 status;
b8dd7b9a 3178 int err;
1da177e4
LT		 3179
3180 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3181 (long long) locku->lu_offset,
3182 (long long) locku->lu_length);
3183
3184 if (check_lock_length(locku->lu_offset, locku->lu_length))
3185 return nfserr_inval;
3186
3187 nfs4_lock_state();
3188
ca364317 3189 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3190 locku->lu_seqid,
3191 &locku->lu_stateid,
f3362737 3192 LOCK_STATE,
1da177e4
LT		 3193 &locku->lu_stateowner, &stp, NULL)))
3194 goto out;
3195
3196 filp = stp->st_vfs_file;
3197 BUG_ON(!filp);
3198 locks_init_lock(&file_lock);
3199 file_lock.fl_type = F_UNLCK;
3200 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3201 file_lock.fl_pid = current->tgid;
3202 file_lock.fl_file = filp;
3203 file_lock.fl_flags = FL_POSIX;
d5b9026a 3204 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3205 file_lock.fl_start = locku->lu_offset;
3206
87df4de8 3207 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3208 nfs4_transform_lock_offset(&file_lock);
3209
3210 /*
3211 * Try to unlock the file in the VFS.
3212 */
fd85b817 3213 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3214 if (err) {
fd85b817 3215 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3216 goto out_nfserr;
3217 }
3218 /*
3219 * OK, unlock succeeded; the only thing left to do is update the stateid.
3220 */
3221 update_stateid(&stp->st_stateid);
3222 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3223
3224out:
f2327d9a 3225 if (locku->lu_stateowner) {
1da177e4 3226 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3227 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3228 }
1da177e4
LT		 3229 nfs4_unlock_state();
3230 return status;
3231
3232out_nfserr:
b8dd7b9a 3233 status = nfserrno(err);
1da177e4
LT		 3234 goto out;
3235}
3236
3237/*
3238 * returns
3239 * 1: locks held by lockowner
3240 * 0: no locks held by lockowner
3241 */
3242static int
3243check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3244{
3245 struct file_lock **flpp;
7eaa36e2 3246 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3247 int status = 0;
3248
3249 lock_kernel();
3250 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3251 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3252 status = 1;
3253 goto out;
796dadfd 3254 }
1da177e4
LT		 3255 }
3256out:
3257 unlock_kernel();
3258 return status;
3259}
3260
b37ad28b 3261__be32
b591480b
BF		 3262nfsd4_release_lockowner(struct svc_rqst *rqstp,
3263 struct nfsd4_compound_state *cstate,
3264 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3265{
3266 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3267 struct nfs4_stateowner *sop;
3268 struct nfs4_stateid *stp;
1da177e4 3269 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3270 struct list_head matches;
3271 int i;
b37ad28b 3272 __be32 status;
1da177e4
LT		 3273
3274 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3275 clid->cl_boot, clid->cl_id);
3276
3277 /* XXX check for lease expiration */
3278
3279 status = nfserr_stale_clientid;
849823c5 3280 if (STALE_CLIENTID(clid))
1da177e4 3281 return status;
1da177e4
LT		 3282
3283 nfs4_lock_state();
3284
3e9e3dbe
N		 3285 status = nfserr_locks_held;
3286 /* XXX: we're doing a linear search through all the lockowners.
3287 * Yipes! For now we'll just hope clients aren't really using
3288 * release_lockowner much, but eventually we have to fix these
3289 * data structures. */
3290 INIT_LIST_HEAD(&matches);
3291 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3292 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3293 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3294 continue;
3295 list_for_each_entry(stp, &sop->so_stateids,
3296 st_perstateowner) {
3297 if (check_for_locks(stp->st_vfs_file, sop))
3298 goto out;
3299 /* Note: so_perclient unused for lockowners,
3300 * so it's OK to fool with here. */
3301 list_add(&sop->so_perclient, &matches);
3302 }
1da177e4 3303 }
3e9e3dbe
N		 3304 }
3305 /* Clients probably won't expect us to return with some (but not all)
3306 * of the lockowner state released; so don't release any until all
3307 * have been checked. */
3308 status = nfs_ok;
0fa822e4
N		 3309 while (!list_empty(&matches)) {
3310 sop = list_entry(matches.next, struct nfs4_stateowner,
3311 so_perclient);
3312 /* unhash_stateowner deletes so_perclient only
3313 * for openowners. */
3314 list_del(&sop->so_perclient);
f044ff83 3315 release_lockowner(sop);
1da177e4
LT		 3316 }
3317out:
3318 nfs4_unlock_state();
3319 return status;
3320}
3321
3322static inline struct nfs4_client_reclaim *
a55370a3 3323alloc_reclaim(void)
1da177e4 3324{
a55370a3 3325 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3326}
3327
c7b9a459
N		 3328int
3329nfs4_has_reclaimed_state(const char *name)
3330{
3331 unsigned int strhashval = clientstr_hashval(name);
3332 struct nfs4_client *clp;
3333
3334 clp = find_confirmed_client_by_str(name, strhashval);
3335 return clp ? 1 : 0;
3336}
3337
1da177e4
LT		 3338/*
3339 * failure => all reset bets are off, nfserr_no_grace...
3340 */
190e4fbf
N		 3341int
3342nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3343{
3344 unsigned int strhashval;
3345 struct nfs4_client_reclaim *crp = NULL;
3346
a55370a3
N		 3347 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3348 crp = alloc_reclaim();
1da177e4
LT		 3349 if (!crp)
3350 return 0;
a55370a3 3351 strhashval = clientstr_hashval(name);
1da177e4
LT		 3352 INIT_LIST_HEAD(&crp->cr_strhash);
3353 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3354 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3355 reclaim_str_hashtbl_size++;
3356 return 1;
3357}
3358
3359static void
3360nfs4_release_reclaim(void)
3361{
3362 struct nfs4_client_reclaim *crp = NULL;
3363 int i;
3364
1da177e4
LT		 3365 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3366 while (!list_empty(&reclaim_str_hashtbl[i])) {
3367 crp = list_entry(reclaim_str_hashtbl[i].next,
3368 struct nfs4_client_reclaim, cr_strhash);
3369 list_del(&crp->cr_strhash);
1da177e4
LT		 3370 kfree(crp);
3371 reclaim_str_hashtbl_size--;
3372 }
3373 }
3374 BUG_ON(reclaim_str_hashtbl_size);
3375}
3376
3377/*
3378 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3379static struct nfs4_client_reclaim *
1da177e4
LT		 3380nfs4_find_reclaim_client(clientid_t *clid)
3381{
3382 unsigned int strhashval;
3383 struct nfs4_client *clp;
3384 struct nfs4_client_reclaim *crp = NULL;
3385
3386
3387 /* find clientid in conf_id_hashtbl */
3388 clp = find_confirmed_client(clid);
3389 if (clp == NULL)
3390 return NULL;
3391
a55370a3
N		 3392 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3393 clp->cl_name.len, clp->cl_name.data,
3394 clp->cl_recdir);
1da177e4
LT		 3395
3396 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3397 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3398 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3399 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3400 return crp;
3401 }
3402 }
3403 return NULL;
3404}
3405
3406/*
3407* Called from OPEN. Look for clientid in reclaim list.
3408*/
b37ad28b 3409__be32
1da177e4
LT		 3410nfs4_check_open_reclaim(clientid_t *clid)
3411{
dfc83565 3412 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3413}
3414
ac4d8ff2 3415/* initialization to perform at module load time: */
1da177e4 3416
e8ff2a84 3417int
ac4d8ff2 3418nfs4_state_init(void)
1da177e4 3419{
e8ff2a84 3420 int i, status;
1da177e4 3421
e8ff2a84
BF		 3422 status = nfsd4_init_slabs();
3423 if (status)
3424 return status;
1da177e4
LT		 3425 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3426 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3427 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3428 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3429 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3430 }
5282fd72
ME		 3431 for (i = 0; i < SESSION_HASH_SIZE; i++)
3432 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3433 for (i = 0; i < FILE_HASH_SIZE; i++) {
3434 INIT_LIST_HEAD(&file_hashtbl[i]);
3435 }
3436 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3437 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3438 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3439 }
3440 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3441 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3442 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3443 }
3444 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3445 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3446 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3447 }
1da177e4 3448 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3449 INIT_LIST_HEAD(&close_lru);
3450 INIT_LIST_HEAD(&client_lru);
3451 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3452 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3453 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3454 reclaim_str_hashtbl_size = 0;
e8ff2a84 3455 return 0;
ac4d8ff2
N		 3456}
3457
190e4fbf
N		 3458static void
3459nfsd4_load_reboot_recovery_data(void)
3460{
3461 int status;
3462
0964a3d3
N		 3463 nfs4_lock_state();
3464 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3465 status = nfsd4_recdir_load();
0964a3d3 3466 nfs4_unlock_state();
190e4fbf
N		 3467 if (status)
3468 printk("NFSD: Failure reading reboot recovery data\n");
3469}
3470
9a8db97e
ME		 3471unsigned long
3472get_nfs4_grace_period(void)
3473{
3474 return max(user_lease_time, lease_time) * HZ;
3475}
3476
c2f1a551
MS		 3477/*
3478 * Since the lifetime of a delegation isn't limited to that of an open, a
3479 * client may quite reasonably hang on to a delegation as long as it has
3480 * the inode cached. This becomes an obvious problem the first time a
3481 * client's inode cache approaches the size of the server's total memory.
3482 *
3483 * For now we avoid this problem by imposing a hard limit on the number
3484 * of delegations, which varies according to the server's memory size.
3485 */
3486static void
3487set_max_delegations(void)
3488{
3489 /*
3490 * Allow at most 4 delegations per megabyte of RAM. Quick
3491 * estimates suggest that in the worst case (where every delegation
3492 * is for a different inode), a delegation could take about 1.5K,
3493 * giving a worst case usage of about 6% of memory.
3494 */
3495 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3496}
3497
ac4d8ff2
N		 3498/* initialization to perform when the nfsd service is started: */
3499
3500static void
3501__nfs4_state_start(void)
3502{
9a8db97e 3503 unsigned long grace_time;
ac4d8ff2 3504
1da177e4 3505 boot_time = get_seconds();
af558e33 3506 grace_time = get_nfs4_grace_period();
d99a05ad 3507 lease_time = user_lease_time;
af558e33 3508 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3509 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3510 grace_time/HZ);
58da282b 3511 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3512 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3513 set_max_delegations();
1da177e4
LT		 3514}
3515
e8ff2a84 3516void
76a3550e 3517nfs4_state_start(void)
1da177e4 3518{
1da177e4 3519 if (nfs4_init)
e8ff2a84 3520 return;
190e4fbf 3521 nfsd4_load_reboot_recovery_data();
76a3550e 3522 __nfs4_state_start();
1da177e4 3523 nfs4_init = 1;
e8ff2a84 3524 return;
1da177e4
LT		 3525}
3526
1da177e4
LT		 3527time_t
3528nfs4_lease_time(void)
3529{
3530 return lease_time;
3531}
3532
3533static void
3534__nfs4_state_shutdown(void)
3535{
3536 int i;
3537 struct nfs4_client *clp = NULL;
3538 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3539 struct list_head *pos, *next, reaplist;
3540
1da177e4
LT		 3541 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3542 while (!list_empty(&conf_id_hashtbl[i])) {
3543 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3544 expire_client(clp);
3545 }
3546 while (!list_empty(&unconf_str_hashtbl[i])) {
3547 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3548 expire_client(clp);
3549 }
3550 }
3551 INIT_LIST_HEAD(&reaplist);
3552 spin_lock(&recall_lock);
3553 list_for_each_safe(pos, next, &del_recall_lru) {
3554 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3555 list_move(&dp->dl_recall_lru, &reaplist);
3556 }
3557 spin_unlock(&recall_lock);
3558 list_for_each_safe(pos, next, &reaplist) {
3559 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3560 list_del_init(&dp->dl_recall_lru);
3561 unhash_delegation(dp);
3562 }
3563
190e4fbf 3564 nfsd4_shutdown_recdir();
1da177e4 3565 nfs4_init = 0;
1da177e4
LT		 3566}
3567
3568void
3569nfs4_state_shutdown(void)
3570{
5e8d5c29
N		 3571 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3572 destroy_workqueue(laundry_wq);
2c5e7615 3573 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3574 nfs4_lock_state();
3575 nfs4_release_reclaim();
3576 __nfs4_state_shutdown();
1da177e4
LT		 3577 nfs4_unlock_state();
3578}
3579
3dd98a3b
JL		 3580/*
3581 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3582 * accessed when nfsd is starting.
3583 */
0964a3d3
N		 3584static void
3585nfs4_set_recdir(char *recdir)
3586{
0964a3d3 3587 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3588}
3589
3590/*
3591 * Change the NFSv4 recovery directory to recdir.
3592 */
3593int
3594nfs4_reset_recoverydir(char *recdir)
3595{
3596 int status;
a63bb996 3597 struct path path;
0964a3d3 3598
a63bb996 3599 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3600 if (status)
3601 return status;
3602 status = -ENOTDIR;
a63bb996 3603 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3604 nfs4_set_recdir(recdir);
3605 status = 0;
3606 }
a63bb996 3607 path_put(&path);
0964a3d3
N		 3608 return status;
3609}
3610
3dd98a3b
JL		 3611char *
3612nfs4_recoverydir(void)
3613{
3614 return user_recovery_dirname;
3615}
3616
1da177e4
LT		 3617/*
3618 * Called when leasetime is changed.
3619 *
d99a05ad
N		 3620 * The only way the protocol gives us to handle on-the-fly lease changes is to
3621 * simulate a reboot. Instead of doing that, we just wait till the next time
3622 * we start to register any changes in lease time. If the administrator
3623 * really wants to change the lease time *now*, they can go ahead and bring
3624 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3625 *
3626 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3627 * when nfsd is starting
1da177e4
LT		 3628 */
3629void
3630nfs4_reset_lease(time_t leasetime)
3631{
d99a05ad 3632 user_lease_time = leasetime;
1da177e4 3633}
Linux 6.x block layer and io_uring tree(s)